首页|Microstructure and properties of WC-11.5%Fe-4%NbH-0.5%C cemented carbides produced by spark plasma sintering
Microstructure and properties of WC-11.5%Fe-4%NbH-0.5%C cemented carbides produced by spark plasma sintering
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NSTL
Elsevier
? 2022 Elsevier Inc.This study investigates the influence of milling parameters and sintering cycle on the microstructure and properties of cemented carbides with an overal WC–11.5wt%Fe–4wt%NbH–0.5wt%C starting powder composition. The raw material powders were milled and mixed in a ring mill or planetary ball mill and sintered at 1150, 1200 or 1250 °C using spark plasma sintering (SPS). The cemented carbide density, Vickers hardness and fracture toughness were evaluated. The microstructure was investigated by optical and scanning electron microscopy using wavelength dispersive X-ray spectroscopy for elemental mapping. The transition from NbH to NbC was identified for all sintered materials. Moreover, microstructural gradients were formed creating bi-layered structured materials with higher hardness edges and tougher cores. The highest microstructural homogeneity and hardness were found for planetary ball milled starting powder sintered at 1250 °C. For these samples, the highest density recorded was 13.69 g/cm3, which also obtained highest hardness values of 1620 Hv and 1589 Hv, on the surface and center regions, respectively.
NSTL
Elsevier
